Chemistry informtion about Octyl Methyl Ketone (CAS NO.693-54-9) is:
IUPAC Name: Decan-2-One
Synonyms: 2-Decanon ; Decan-2-One ; N-C8h17coch3 ; Octyl Methyl Ketone ; Octylmethylketone ; Decanone ; Methyl Octyl Ketone ; Methyl N-Octyl Ketone
MF: C₁₀H₂₀O
MW: 156.27
EINECS: 211-752-6 
Melting Point: 3.5 °C(lit.)
Density: 0.819 g/cm³
Flash Point: 71.1 °C
Boiling Point: 212.7 °C at 760 mmHg
Vapour Pressure: 0.248 mmHg at 25°C 
Enthalpy of Vaporization: 43.07 kJ/mol
Refractive Index:  n20/D 1.425(lit.)
FEMA: 4271
BRN: 1747463
Following is the molecular structure of Octyl Methyl Ketone (CAS NO.693-54-9) is:

Reported in EPA TSCA Inventory.

Slightly toxic by ingestion. A flammable liquid. When heated to decomposition it emits acrid smoke and irritating vapors. 
Safety Statements:
S24/25:Avoid contact with skin and eyes.
WGK Germany: 2
RTECS: HE0725000
F:
F 10: Keep under argon.
F 23: Sensitive to air.
HS Code: 29141990

DOT Classification:  3; Label: Flammable Liquid

 Octyl Methyl Ketone (CAS NO.693-54-9) is a clear very slight yellow liquid.
First Aid Measures:
Ingestion: Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
Inhalation: Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
Skin: Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Eyes: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
Handling and Storage:
Storage: Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling: Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.